| Prospect Heights to Kingsville (Texas) | 1,153.25 mi (1,855.97 km) |
| Prospect Heights to Kinston (North Carolina) | 729.23 mi (1,173.58 km) |
| Prospect Heights to Kirkland (Washington) | 1,706.65 mi (2,746.59 km) |
| Prospect Heights to Kirksville (Missouri) | 275.29 mi (443.04 km) |
| Prospect Heights to Kirkwood (Missouri) | 276.67 mi (445.26 km) |
| Prospect Heights to Kiryas Joel (New York) | 710.78 mi (1,143.89 km) |
| Prospect Heights to Kissimmee (Florida) | 1,021.03 mi (1,643.19 km) |
| Prospect Heights to Klamath Falls (Oregon) | 1,722.04 mi (2,771.36 km) |
| Prospect Heights to Knightdale (North Carolina) | 667.85 mi (1,074.80 km) |
| Prospect Heights to Knik-Fairview (Alaska) | 2,818.54 mi (4,536.00 km) |
| Prospect Heights to Knoxville (Tennessee) | 474.43 mi (763.52 km) |
| Prospect Heights to Kokomo (Indiana) | 146.83 mi (236.31 km) |
| Prospect Heights to Kuna (Idaho) | 1,439.35 mi (2,316.42 km) |
| Prospect Heights to Kyle (Texas) | 1,003.20 mi (1,614.49 km) |
| Prospect Heights to La Cañada Flintridge (California) | 1,722.24 mi (2,771.68 km) |
